lokaldisruption

So i purchased the blue fog light overlays from rx8strakes via ebay because rx8strakes.com was sold out of that color and just recently i was curious to why i have not received the item i purchased on 12/29/08. So i emailed rx8strakes about the problem, forgetting that i had a tracking number...so they replied telling me the item was shipped out and evidently received on January 2, 2008, to my house... So now im stuck and confused to what has happened to my item. The usps website confirms that it was recieved on the 2nd but i lack the product. What should my next step be? shuold i contact rx8strakes directly and tell them my problem or usps? and in my opinion im guess maybe usps delivered it to the wrong house possibly but then i would have thought them to send it bak out...eventually getting here. I dont see how anyone could steel the package from my porch because the package is only good for rx8 fog lights...so whats my next step...any advice is helpful guys...
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o ya and i have purchased led's from rx8strakes.com directly before and shipping was fantastic and item arrived successfully.